Question

I have my tableView connected to a database table.
When I tap on a row I push a view with all the details of the item. Every thing works fine.

This is the code in the main class:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    DetailsViewController *detailViewController = [[DetailsViewController alloc] initWithNibName:@"DetailsViewController" bundle:nil];

    NSDictionary *rowVals = (NSDictionary *) [shoppingListItems objectAtIndex:indexPath.row];

    NSString *titleString = [(NSString *) [rowVals objectForKey:@"item"] autorelease];
    NSString *category = [(NSString *) [rowVals objectForKey:@"groupid"] autorelease];
    NSNumber *priceNumber = [(NSNumber *) [rowVals objectForKey:@"price"] autorelease];
    NSString *priceString = [[priceFormatter stringFromNumber: priceNumber] autorelease];
    NSDate *date = [(NSDate *) [rowVals objectForKey:@"dateadded"] autorelease];
    NSString *dateString = [[dateFormatter stringFromDate:date] autorelease];
    NSNumber *IO = [(NSNumber *) [rowVals objectForKey:@"incout"] autorelease];

    detailViewController.stringTitle = titleString;
    detailViewController.categoryVar = category;
    detailViewController.priceVar = priceString;
    detailViewController.dateVar = dateString;
    detailViewController.IOVar = IO;

    [self.navigationController pushViewController:detailViewController animated:YES];
    [detailViewController release];
}

and this in the DetailsViewController.m

- (void)viewDidLoad {    
    [super viewDidLoad];
    self.navigationItem.title = stringTitle;
    nome.text = stringTitle;
    prezzo.text = priceVar;
    data.text = dateVar;
    if ([IOVar isEqualToNumber:[NSNumber numberWithInt:1]]) {
        categoria.hidden = NO;
        categoriaLabel.hidden = NO;
        photoLabel.hidden = NO;
        categoria.text = categoryVar;
    } else if ([IOVar isEqualToNumber:[NSNumber numberWithInt:0]]){
        categoria.hidden = YES;
        categoriaLabel.hidden = YES;
        photoLabel.hidden = YES;
        categoria.text = @"";
    }
}

If I push and go back more than 3 times my app crash with EXC_BAD_ACCESS in main.m

Thanks if you read till here, and sorry for my bad english.

Answer 1

That definitely sounds like you’re over-releasing an object (aka a ‘zombie’).

Xcode Instruments is an excellent tool for tracking down zombies.

Read about it here, and give it a go.

http://www.markj.net/iphone-memory-debug-nszombie/

It’s much more fun than killing zombies in Call of Duty 😉

Good luck!